This Article is Updated on – 09/07/2023, Originally posted on – 14/10/2022 Primary and secondary pollutants are categorized as air pollutants depending on their formation and source of emission. There are numerous types of air contaminants, some of which are problematic, depending on their natural and manmade origin. National Ambient Air Quality Standards (NAAQS) ensure, … Continue reading What Are the Primary and Secondary Pollutants?